
Choosing the right Email Security Gateway is critical for business communication security. This comparison shows the most important criteria and typical pitfalls.
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Choosing the right Email Security Gateway is one of the most important IT security decisions for businesses. But the market is confusing: dozens of providers promise "comprehensive protection," yet the actual features, data processing, and pricing models differ considerably.
This guide helps you make the right decision — with a structured evaluation matrix and the key questions you should ask every provider.
Not every gateway protects equally well. Look for:
Question for the provider: "Can you show a recent incident where your system detected a zero-day attack?"
Not all encryption is created equal:
| Criterion | Important | Why |
|---|---|---|
| S/MIME support | ✅ | Standard for government agencies and law firms |
| PGP support | ✅ | Standard for maximum security |
| Centralized certificate management | ✅ | Without central management, implementation fails |
| Policy-based encryption | ✅ | Automation without user interaction |
| Fallback mechanisms | ✅ | What happens when the other side doesn't support S/MIME? |
More on the differences: S/MIME vs. PGP: Comparison for Businesses
Details: Email Disclaimer Management for Microsoft 365
For GDPR compliance, the following is critical:
Also read: Digital Sovereignty in Email Encryption
Use this checklist during evaluation:
Many providers list impressive feature lists, but the actual implementation is often superficial. Always test yourself with a proof-of-concept phase.
Some gateways bind you to proprietary formats or workflows. Look for standard protocols (SMTP, S/MIME, PGP) and easy migration.
Gateways that process emails in the US carry a GDPR risk — even with the EU-US Data Privacy Framework. For maximum security, choose EU hosting and digital sovereignty.
A gateway that takes weeks to set up becomes a project killer. Cloud-native solutions like Conbool are ready in under an hour.
Conbool meets all 8 comparison criteria:
| Criterion | Conbool |
|---|---|
| Threat detection | ✅ Multi-layered with AI (MailGuard) |
| Encryption | ✅ S/MIME + PGP automatic (SecureMail) |
| DLP | ✅ Pattern-based, granular rules |
| Disclaimers | ✅ Dynamic templates (Disclaimer) |
| Microsoft 365 | ✅ Native MX integration |
| Data sovereignty | ✅ EU-only, Made in Germany |
| Support | ✅ Local-language, guaranteed SLA |
| Pricing | ✅ Transparent per mailbox |
That depends on your requirements. For German and European businesses with GDPR and NIS2 requirements, a gateway with EU hosting, automatic encryption, and local-language support is crucial.
Cloud-based gateways typically cost between 2 and 10 euros per mailbox/month. Many providers offer free trial periods — Conbool offers 30 days.
Further reading: